Green walls are "it" accessories in the sustainable design world. But a planted wall that doesn't stay green is neither beautiful nor sustainable; reinstalling or swapping out such a feature wastes materials and money. Making sure that the green-wall technology worked was especially important for Longwood Gardens, a former Quaker farm and DuPont estate in Kennett Square, Pa. A constant stream of visitors expects to be wowed by a variety of flora, and environmental stewardship is an important part of Longwood Gardens' mission. The green wall in the institution's new East Conservatory Plaza, designed by British landscape architect Kim Wilkie in association with Philadelphia's Wells Appel, is the largest in North America, at more than 4,000 square feet.
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